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  Metal free-covalent triazine frameworks as oxygen reduction reaction catalysts – structure–electrochemical activity relationship

Sönmez, T., Belthle, K. S., Iemhoff, A., Uecker, J., Artz, J., Bisswanger, T., et al. (2021). Metal free-covalent triazine frameworks as oxygen reduction reaction catalysts – structure–electrochemical activity relationship. Catalysis Science & Technology, 11(18), 6191-6204. doi:10.1039/D1CY00405K.

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 Creators:
Sönmez, Turgut1, 2, Author
Belthle, Kendra Solveig1, 3, Author              
Iemhoff, Andree1, Author
Uecker, Jan1, Author
Artz, Jens1, Author
Bisswanger, Timo4, Author
Stampfer, Christoph4, Author
Hamzah, Hairul Hisham5, Author
Nicolae, Sabina Alexandra6, Author
Titirici, Maria-Magdalena6, Author
Palkovits, Regina1, Author
Affiliations:
1Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany, ou_persistent22              
2Department of Energy Systems Engineering, Technology Faculty, Karabuk University, 78050 Karabük, Turkey, ou_persistent22              
3Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950290              
4JARA-FIT and 2nd Institute of Physics A, RWTH Aachen University, 52074 Aachen, Germany, ou_persistent22              
5School of Chemical Sciences, Universiti Sains Malaysia (USM), Gelugor, Penang, Malaysia, ou_persistent22              
6School of Engineering and Materials Science and Materials Research Institute, Queen Mary University of London , London E14 NS, UK, ou_persistent22              

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 Abstract: Nitrogen-rich porous carbon polymers are highly promising oxygen reduction reaction (ORR) catalysts and possess great potential to replace Pt-based precious metals used in energy storage and conversion systems. In this study, covalent triazine frameworks (CTFs) were synthesized via an ionothermal route based on different monomers and synthesis temperatures (400–750 °C) and tested in alkaline media with a rotating disk electrode (RDE). The effect of the applied monomer and temperature on the surface functionalities of the frameworks and thus correlation to their ORR activities are deeply discussed. Micro/mesoporous, hierarchically ordered and highly conductive N-rich materials with up to 2407 m2 g−1 specific surface areas and 2.49 cm3 g−1 pore volumes were achievable. Owing to the high surface area (1742 m2 g−1), pore volume (1.56 cm3 g−1), highest conductivity, electrochemically active surface area and hierarchical mesoporous structure, CTF DCBP-750 facilitated 0.9 V onset potential (only 0.06 V larger than that of the benchmark 10 wt% Pt/C) with 5.1 mA cm−2 limiting current density. In addition to the structural properties, graphitic nitrogen species, active sites responsible for binding and activating O2, rather than pyridinic nitrogen appear to be more important for the overall ORR performance. Thus, the trade-off point is crucial to obtain optimal ORR activity with metal-free CTFs.

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Language(s): eng - English
 Dates: 2021-03-072021-08-062021-09-21
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/D1CY00405K
 Degree: -

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Title: Catalysis Science & Technology
  Abbreviation : Catal. Sci. Technol.
Source Genre: Journal
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Publ. Info: Cambridge : Royal Society of Chemistry
Pages: - Volume / Issue: 11 (18) Sequence Number: - Start / End Page: 6191 - 6204 Identifier: ISSN: 2044-4753
CoNE: https://pure.mpg.de/cone/journals/resource/2044-4753